Symptom
POST failure seen a Linecard slot on standby switch.
Ports can not handle traffic.
Issue was mostly seen with testbed handling EoMPLS traffic.
There were instance of similar issue with other traffic as well some times.
Conditions
Customer senario, Trigger not known.
Can be simulated in internal lab:
====================
1) Boot the SVL setup, one of the chassis will boot up as Active.
2) After SSO, do Active OIR, Redundancy force-switchover.
3) After the SVL stack is formed again, we see POST failure on few ports one of the Slot. all ports belong to a SLI group.
Root Cause Analysis:
=============
EpfNifFifoDepth.Status stuck at a non-zero value. leading to POST Failure and Phyloopback failure.
CLI to confirm if the EpfNifFifoDepth.Status is stuck or not.
=====================================
show platform hardware fed sw standby fwd-asic register read register-name EpfNifPortFifoDepth- asic core
show platform hardware fed sw standby fwd-asic register read register-name EpfInfo- asic core
example:
======
show platform hardware fed sw standby fwd-asic register read register-name EpfNifPortFifoDepth-10 asic 0 core 0
show platform hardware fed sw standby fwd-asic register read register-name EpfInfo-10 asic 0 core 0
Workaround
NA, Reload should not be considered as workaround.
BUT Reload "may" fix the issue reported here.
